The solution is:
go to themes\default-bootstrap\js\modules\blocktopmenu\js
open blocktopmenu.js
delete touchStart from line 83-89-95 (simple change "click touchstart" to only "click")
SOLVED
Press button more than 2 second is equivalent to "select for copy/paste" an element on safari (ios).
This is definitely not a solution, I am amazed by reply so shallow.
IT'S A BUG!